Rotary pump.



No. 883,271. PATENTED MAR. s1, 1908.- G. WILSON. 'ROTARY PUMP.

APPLICATION FILED SEPT.16,1907.

2 SHEETS-SHEET 2.

/Nvfnron By @ngel/ra ATTORNEYS j 4 Wmvfssgs GEORGE WILSON,.OF SHARROW,SHEFFIELD, ENGLAND.

ROTARY PUMP.

Specification of Letters Patent.

Patented March 31, 1908.

Application filed September 16, 1907. Serial No. 393,000.

.To all whom 'it may concern:

Be it known that I, GEORGE WILSON, a sub-` j ect of the King of GreatBritain, and residing at Sharrow7 Sheflield, in the county of York,England, have invented certain new and useful Improvements in RotaryPumps, of which the following is a specification, such as will en-ablethose skilled in the art to which. it appertains to make and use thesame.

This invention relates to rotary pumps, and the object thereof is torovide an improved device of this class which may be also used undercertain conditions as a motor; and the invention consists in a novelconstruction of working parts enabling said parts to be easily,accurately and uickl machined; moreover the motion df eac part beingpurely rotary is capable of being perfectly balanced so that when theump is required to workon compressible guids it may be driven at highspeeds without risk or undue frictional resistances.

With my improved construction a pump may be used for either compressibleor incompressible fluids or it can be used as a motor when subjected tofluids under adequate pressure.

That my invention may be better understood, I will now describe the sameby reference to the drawings.

Figure 1 is a transverse section of a ump through the center as on line1--2 of ig. 2; Fig. 2 a longitudinal vertical section of the samethrough the axis of the casing as on line 3 4 of Fig. 1; Fig. 3 an endview vof the pump with the end cover of the 'casing removed; and, Fig. 4consists of a series of four diagrams showing the actual position ofeach working part at each quarterrevoliltion of the driving shaft, andFig. 5 a perspective view of the details of the construction.

In constructing a pump which embodies my improvements Iprovidey acylinder or casing A, having a suitable base for fixing and providedwith inlet and outlet branches V and S; and close said cylinder ends bymeans of plates or covers F F one at each end respectively, and each endplate is provided eccentrically with a bearing wherein a toothed shaftor spindle I is carried, the eccentricity or distance from the center ofthe covers to the center of the shaft being equal to the eccentricradius ofan eccentric drum C keyed upon the Vspindle I.

Fitting inside cylinder A and revolving within it Iprovide a cylindricaldrum B, Fig. 1,` diametrlcally across which I form a rectangular slot,the slot terminating at each end in openings or ports in the peripheryof the drum, which, as the drum revolves come alternately incommunication with suction and delivery ports V and VS in the outercasing A. The said drum B is machined internally to form slides asshown, within which the eccentric drum C fits, revolves and reciprocatesfreely, the said drum being fixed b a key L upon the driving shaft I,supportedY in bearings G and-H upon the outer covers or end plates F F,Fig. 2.

The width of the slot in thedrum B measured in the direction of the axisof the drum is necessarily less than the length of the drum so that theend portions N N are left thereon. These endgportions are bored out to adiameter which is equal to the transverse width of the slot; these holesmay'be finished with a milling cutter, the same cutter being used tofinish the inner surfaces of the drum B between which the drum Crevolves and slides.

The ends of the slotted drum B, are covered'by circular plates E and Dfirmly and concentrically secured thereto, each. plate being providedwith a concentric boss e and d vrespectively which revolves incorresponding annular bushes fitted inside of the outer covers F F. Thesaid end plate B is bored concerltrically to clear the nut K while thecenter." o ening in the other end provide with internal spur teethforming an internal wheel/which gears with the pinion J cut out of asolid collar u on the dividing late E is y shaft I, the number of teeth1n thesaid pinion bein in the proportion of one to two of the num er ofteeth in the internal wheel so that the shaft I shall makev tworevolutions for each revolution of the drum B, the end plate E and itsinternal wheel is so adjusted that when the drum C is in the center ofthe slot the eccentric radius of the drum C is at right angles of thecenter line of the slot.

The eccentric drum C is not only secured to the shaft I by the key L',but 1s further fixed by a flanged nut K which holds it against the endface of the pinion J. For the pur ose of passing the drum C into theslot of t e drum B, it is necessary to remove the end plate E, and whenthe pump is to be driven at high speeds, the drum C must be loo that isthe eccentric drum C is shown at its in communicatibn with the inletbranch V in during the next half of a revolution of drum carefullybalanced on the shaft I. This can be readily accomplished by filling thespaces M M with the necessary amount of lead or other heavy metal and tofacilitate this operation the drum C may be cast in two parts each parthaving one end closed, the two portions of the drum being then fixed onthe shaft with the open ends together.

F ig. 3 shows clearly how the slotted drum B is geared to the shaft Iby` the internal wheel with teeth P and the pinion J there being twicethe number of teeth in the wheel that there is in the pinion.

In Fig. 4 diagram 1 corresponds with Fig. l

greatest distance from the center of drum B.

The action of such a pump is as follows Assuming that the shaft Irotates in a clockwise direction, the slotted drum B will rei volve inthe same direction but with only one half the angular velocity of thesaid shaft, the eccentric drum C will revolve Within the slot andreciprocate therein and its stroke within the slot (will be four timesthe eccentric radius so that while one end of the slot is the casing A,the eccentric drum C will be receding from the said branch and therebydrawing into the slot while at the same time fluid will be ejected fromthe opposite end of the slot and so escape by the delivery branch S.When the slotted drum B has completed one half of a revolution, theeccentric drum C will have made one complete revolution, and

B a similar cycle of operations will take place but with the ends of theslot reversed.

Having fully described my invention, what I claim as new `-and desire tosecureby Letters Patent, is

In a rotary pump, a cylindrical casing provided at its op osite sideswith inlet and outlet ports and aving end plates provided in their innerfaces with central circular recesses, a shaft passing eccentricallythrough said casing and said recesses, an eccentric drum keyed to saidshaft, a second drum mounted on the eccentric drum within said rcasingand provided with a longitudinal and diametric slot which opens at theopposite sides thereof-to forni ports which correspond with the ports inthe casing, said second drum being provided with end openings thediameter of which is equal to the width of the transverse slot therein,and said second drum being also provided with end plates having on theirinner faces eccentric bosses which fit in the end openings in said drumand on their outer faces eccentric bosses which fit in the recesses inthe inner faces of 60 the end plates of the casing, said end plates ofthe second drum being also provided with central openings through whichthe shaft eccentrically passes, and one of said openings being providedwith an'internal gear, and

said shaft being also provided with a pinion which meshes with saidgear.

In testimony that I claim the foregoing as my invention I have signed myname in presence of the subscribing witnesses this fth day of September1907.

GEORGE WILSON.

